Draft: Move `JobCoordinator` workers into `Gitlab::BackgroundMigration`
What does this MR do and why?
This creates a first-class mapping of workers to databases that makes it clear how the workers are resolved to connections.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Kamil Trzciński (Back 2025-01-01)